标签:lse val ifd ini null term 描述符 obj ali
197 void *zmq_init (int io_threads_) 198 { 199 if (io_threads_ >= 0) { 200 void *ctx = zmq_ctx_new (); 201 zmq_ctx_set (ctx, ZMQ_IO_THREADS, io_threads_); 202 return ctx; 203 } 204 errno = EINVAL; 205 return NULL; 206 }
128 // New context API 129 130 void *zmq_ctx_new (void) 131 { 132 // We do this before the ctx constructor since its embedded mailbox_t 133 // object needs the network to be up and running (at least on Windows). 134 if (!zmq::initialize_network ()) { 135 return NULL; 136 } 137 138 // Create 0MQ context. 139 zmq::ctx_t *ctx = new (std::nothrow) zmq::ctx_t; /* 这里使用的是不抛出异常的new,因为zmq作为库来说,要与不支持异常的调用者兼容,如C。*/ 140 if (ctx) { 141 if (!ctx->valid ()) { 142 delete ctx; 143 return NULL; 144 } 145 } 146 return ctx; 147 } 148
68 zmq::ctx_t::ctx_t () : 69 _tag (ZMQ_CTX_TAG_VALUE_GOOD), 70 _starting (true), 71 _terminating (false), 72 _reaper (NULL), 73 _max_sockets (clipped_maxsocket (ZMQ_MAX_SOCKETS_DFLT)), 74 _max_msgsz (INT_MAX), 75 _io_thread_count (ZMQ_IO_THREADS_DFLT), 76 _blocky (true), 77 _ipv6 (false), 78 _zero_copy (true) 79 { 80 #ifdef HAVE_FORK 81 _pid = getpid (); 82 #endif 83 #ifdef ZMQ_HAVE_VMCI 84 _vmci_fd = -1; 85 _vmci_family = -1; 86 #endif 87 88 // Initialise crypto library, if needed. 89 zmq::random_open (); 90 }
36 zmq::reaper_t::reaper_t (class ctx_t *ctx_, uint32_t tid_) : 37 object_t (ctx_, tid_), 38 _mailbox_handle (static_cast<poller_t::handle_t> (NULL)), 39 _poller (NULL), 40 _sockets (0), 41 _terminating (false) 42 { 43 if (!_mailbox.valid ()) 44 return; 45 /* Linux下,poller_t实际上即为epoll_t*/ 46 _poller = new (std::nothrow) poller_t (*ctx_); 47 alloc_assert (_poller); 48 //这里的mailbox.get_fd()得到该reaper_t拥有的mailbox的读描述符 49 if (_mailbox.get_fd () != retired_fd) { 50 _mailbox_handle = _poller->add_fd (_mailbox.get_fd (), this); 51 _poller->set_pollin (_mailbox_handle); 52 } 53 54 #ifdef HAVE_FORK 55 _pid = getpid (); 56 #endif 57 }
标签:lse val ifd ini null term 描述符 obj ali
原文地址:https://www.cnblogs.com/mysky007/p/12287874.html